Professor Hiroshi Ishiguro and his doppleganger were one of the main subplots featured in the “Mechanical Love” documentary, which was really interesting although not very well produced: http://www.youtube.com/watch?v=hIHl-eGHAdQ

Heh, put that robot into your backyard, sitting on a chair and ostensibly reading a book…

Then go commit whatever you wish and later claim an alibi. After all, your neighbors have seen you.

This interesting kind of problem will get worse as the androids get better. Up to the nasty point where the roles switch and you will be the one sitting in the backyard, while your android twin is robbing someone.